Improvement in scroll-saws



H. J. GORDESMA1\T,.Trl

'sc-ROLL-SAWS. v No. 177,621.-v Patented May 23,1876.

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--of the machine.

UNITED STATES PATE 'r HENRY J. oonDEsMAN, JE., oF oINoINNATI, oHIo,AssIeNon To ooRDEsMAN,

- EGAN a oo., oF sAME PLAGE.

e IMPROVEMENT |N scRoLL-sAws.

Specification forming part of Letters Patent No. 177,62 l, dated May 23,1876; application ledA February 19, 1876.

To all whom it may concern Be it known that I, HENRY J. CoRDEsMAN, Jr.,of Cincinnati, Hamilton county, and State of Ohio, have invented anImprovement in Reciprocating Scroll-Saws, of which the following is aspecification: y

My invention consists, rst, in a peculiar construction'of the sawcross-head, by which provision is made for the easy removal and correctand ready readjustment of the saw; second, in a solid cross-head for thesaw, hav ing flaring notch with depressionsfor the reception of the saw;third, in a new and peculiar device for shifting the belt, and at thelsame time arresting the momentum of the saw and parts connected thereto.

I n the accompanying drawings, Figure l is a perspective view of themoving parts of my saw, showing also a portion of the frame of themachine. Fig. 2 is a perspective view of the saw-slide, to which theupper end of the pitmanand lower end of the saw are secured. Fig. 3 is asection of the saw-slide through the pitman-trunnions.

A is a portion ofthe frame of the machine, havinga bearing, a, fordriving-shaft B, and bearing a for belt-shifting rod (.l. D is the crankor brake wheel, (secured to shaft B,) to which is attached the pitman E.On shaft B are the loose and tight pulleys b b', respectively, and-onrod C are a couple of fingers, c

, c', for shifting the belt from one pulley to the other. Secured to theupper end of pitman E, which is split at e to receive it, is aretaining-hook or cross-head, F, and guide-plates G G,lformed toencompass the usual slideways These plates are firmly secured to thecross-head F by means of small screws shown in Fig. 3.' lThe cross-headF is formed of solid steel,and, as seen in Fig. 3, has formed upon ittwo trunnions, f ji, to enter the arms ofthe pitman E, and thereby forma swiveling connection. The arms of the pitman are held upon thesetrunnions by means of screws el c2 and plates c3 c4. The

arms of the pitnian are formed to receive thel trunnionsff, and take uplost motion in the swivelingjoint by means of slits c5 and bolts e, asseen in Fig. 2. The upper part of crosshead F is enlarged in width, andextends depressions are above the top'of pitman E, having a slot, H,which flares laterally in wedge-shape. 0n the projecting side ofcross-head the plate G is secured. rlhe plate G at the top is bent over,and extends laterally outward to form a step, gb, over the top of pitmanE. On the inner surfaces ofthe slot H are horizontal depressions L hl,and at right angles to these perforations '102, 'whose limits extendabove the topedges of the depressions lt h1. The lower end of thesaw-blade I has cylindrical projections t', from its sides, in suchposition that when the end of the saw rests upon the step g of plate Gthey will be directly in line with depressions h h1 in slot H, and caneasily be slid into theslot by reason of the iiaring edges abovementioned; and by reason of the upward extension ofthe perforations h2beyond the depressions IL h1 the crosshead F will retain the sawfbladein operation,

When under strain.

It is evident by the construction vof abovementioned device, consistingof cross-head F, having flaring slot H, depressions It 71,1, andperforations h2, and the plate G and step g, that great facility isprovided for replacing the saw after it has been removed to enter insideWork, as the step g limits its downward motion, and guides it intoplace. On the lug a, extending from frame A, is secured a footlever, J,having cam-projectionj. K is a brakeblock, iitted to embrace accuratelythe lower edge of the wheel which it rests. The brake K and lever J areboth secured to the lug a by means of a bolt, j', passing through themlSecured to frame A' is a'lug,o,3,upon which is secured and opcrates abell-crank lever, L, whose long arm 'l connects with a rod, M, attachedto the shifting-rod C, which slides in bearing a', and whose short arm Zconnects with rod N attached to lever J at a point close to thecamprojection j. Y

By reason of the Acombined action of parts just 'described thebrake-block K will arrest the motion of wheel D at the same time thatthe shifting-rod C shifts the belt from tight pull-ey b to loose. pulleyb, and an instantaneous stoppage ofthe saw will be the result.

NEIGE. e

D, and it has a cam provjcction, 7c, .to correspond with cam. j, upon`depressions h h1 h2, substantially as and for the purpose specified.

2. The solid cross-head F, provided with flaring jaw H, havingdepressions h h1 h2, arranged substantially as and for the purposespecified.

3. In combination with the brake-Wheel D and fast and loose pulleys b bthe cam-brake K, cam foot-lever J, and shifting-rod C, connected andoperating substantially as land for the purpose specified. Y

In testimony of which invention I hereunto set my hand.

HENRY J. CORDESMAN, JR.

Witnesses:

' EDGAR J. Gnoss, JoHN E, JONES.

